CVE catalog

CVE-2026-42489

[This CNA information record relates to multiple CVEs…

[CVE catalog]

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] To create and manage guests, domctl operations are used by the control domain, a possible Xenstore domain, or by a domain controlling a particular guest. Some of these operations may not be executed in parallel, so a system-wide lock is used. The way that lock is acquired is, however, not providing any fairness. This is CVE-2026-42489. Furthermore, with XSM/Flask in use, the lock acquire will, for some operations, occur ahead of any permission checking. This is CVE-2026-42490.

Severity
Medium · CVSS 5.3CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H
Published
Source
[NVD] · [CVE record]
EPSS
0.08% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence
Original provider fields
{
  "package_releases": [
    {
      "name": "xen",
      "status": "fixed",
      "release": "sid",
      "version": "4.20.4+39-gf1e1321c87-1"
    },
    {
      "name": "xen",
      "status": "fixed",
      "release": "forky",
      "version": "4.20.4+39-gf1e1321c87-1"
    },
    {
      "name": "xen",
      "status": "fixed",
      "release": "trixie",
      "version": "4.20.3+127-gc42374a105-0+deb13u1"
    },
    {
      "name": "xen",
      "status": "fixed",
      "release": "trixie-security",
      "version": "4.20.4+39-gf1e1321c87-0+deb13u1"
    },
    {
      "name": "xen",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "4.17.5+72-g01140da4e8-1"
    },
    {
      "name": "xen",
      "status": "fixed",
      "release": "bookworm-security",
      "version": "4.17.7-0+deb12u1"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "xen",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "4.20.3+127-gc42374a105-1"
    },
    {
      "bug": null,
      "name": "xen",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "4.20.3+127-gc42374a105-1"
    },
    {
      "bug": null,
      "name": "xen",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "4.20.3+127-gc42374a105-0+deb13u1"
    },
    {
      "bug": null,
      "name": "xen",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "4.17.7-0+deb12u1"
    }
  ],
  "distribution_packages": [
    {
      "name": "xen",
      "ecosystem": "cpe",
      "fixed_version": "not yet fixed"
    },
    {
      "name": "xen",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.5-r9"
            }
          ]
        }
      ],
      "release": "3.20",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "4.18.5-r9",
      "provider_record_id": "ALPINE-CVE-2026-42489"
    },
    {
      "name": "xen",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.19.5-r4"
            }
          ]
        }
      ],
      "release": "3.21",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "4.19.5-r4",
      "provider_record_id": "ALPINE-CVE-2026-42489"
    },
    {
      "name": "xen",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.20.3-r4"
            }
          ]
        }
      ],
      "release": "3.22",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "4.20.3-r4",
      "provider_record_id": "ALPINE-CVE-2026-42489"
    },
    {
      "name": "xen",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.20.3-r4"
            }
          ]
        }
      ],
      "release": "3.23",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "4.20.3-r4",
      "provider_record_id": "ALPINE-CVE-2026-42489"
    },
    {
      "name": "xen",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.21.1-r6"
            }
          ]
        }
      ],
      "release": "3.24",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "4.21.1-r6",
      "provider_record_id": "ALPINE-CVE-2026-42489"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [libxencall1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [libxen-dev]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [libxendevicemodel1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [libxenevtchn1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [libxenforeignmemory1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [libxengnttab1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [libxenhypfs1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [libxenmisc4.17]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [libxenstore4]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [libxentoolcore1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [libxentoollog1]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [xen-doc]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [xen-hypervisor-4.17-amd64]Unknown

    Source package: [xen]

    Details (2)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [xen-hypervisor-4.17-amd64-dbg]Unknown

    Source package: [xen]

    Details (2)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [xen-hypervisor-4.17-arm64]Unknown

    Source package: [xen]

    Details (2)

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [xen-hypervisor-4.17-arm64-dbg]Unknown

    Source package: [xen]

    Details (2)

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [xen-hypervisor-common]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [xenstore-utils]Unknown

    Source package: [xen]

    Details (4)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [xen-system-amd64]Unknown

    Source package: [xen]

    Details (2)

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · amd64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

  • [xen-system-arm64]Unknown

    Source package: [xen]

    Details (2)

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

    • 4.17.5+72-g01140da4e8-1 · arm64 · bookworm-security

      Affected · Fixed: 4.17.7-0+deb12u1

      nvd · xen · debian · bookworm; nvd · xen · debian · 12

Next results

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]